linux-kernel - [PATCH 6/8] docs: counter: add latch_mode and latched

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Date:   Sat, 16 Oct 2021 20:33:41 -0500
From:   David Lechner <david@...hnology.com>
To:     linux-iio@...r.kernel.org
Cc:     David Lechner <david@...hnology.com>,
        William Breathitt Gray <vilhelm.gray@...il.com>,
        Robert Nelson <robertcnelson@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 6/8] docs: counter: add latch_mode and latched_count sysfs attributes

This documents new counterX/latch_mode* and
counterX/countY/latched_count* attributes.

The counterX/signalY/*_available are moved to the
counterX/countY/*_available section similar to the way we already have
The counterX/*_component_id and The counterX/signalY/*_component_id
grouped together so that we don't have to start a 3rd redundant section
for device-level *_available section.

Signed-off-by: David Lechner <david@...hnology.com>
---
 Documentation/ABI/testing/sysfs-bus-counter | 39 ++++++++++++++++-----
 1 file changed, 30 insertions(+), 9 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-bus-counter b/Documentation/ABI/testing/sysfs-bus-counter
index 37d960a8cb1b..78bb1a501007 100644
--- a/Documentation/ABI/testing/sysfs-bus-counter
+++ b/Documentation/ABI/testing/sysfs-bus-counter
@@ -59,10 +59,13 @@ What:		/sys/bus/counter/devices/counterX/countY/error_noise_available
 What:		/sys/bus/counter/devices/counterX/countY/function_available
 What:		/sys/bus/counter/devices/counterX/countY/prescaler_available
 What:		/sys/bus/counter/devices/counterX/countY/signalZ_action_available
+What:		/sys/bus/counter/devices/counterX/latch_mode_available
+What:		/sys/bus/counter/devices/counterX/signalY/index_polarity_available
+What:		/sys/bus/counter/devices/counterX/signalY/synchronous_mode_available
 KernelVersion:	5.2
 Contact:	linux-iio@...r.kernel.org
 Description:
-		Discrete set of available values for the respective Count Y
+		Discrete set of available values for the respective component
 		configuration are listed in this file. Values are delimited by
 		newline characters.
 
@@ -147,6 +150,14 @@ Description:
 			updates	the respective count. Quadrature encoding
 			determines the direction.
 
+What:		/sys/bus/counter/devices/counterX/countY/latched_count
+KernelVersion:	5.16
+Contact:	linux-iio@...r.kernel.org
+Description:
+		Latched count data of Count Y represented as a string. The value
+		is latched in based on the trigger selected by the
+		counterX/latch_mode attribute.
+
 What:		/sys/bus/counter/devices/counterX/countY/name
 KernelVersion:	5.2
 Contact:	linux-iio@...r.kernel.org
@@ -209,6 +220,7 @@ What:		/sys/bus/counter/devices/counterX/countY/count_mode_component_id
 What:		/sys/bus/counter/devices/counterX/countY/direction_component_id
 What:		/sys/bus/counter/devices/counterX/countY/enable_component_id
 What:		/sys/bus/counter/devices/counterX/countY/error_noise_component_id
+What:		/sys/bus/counter/devices/counterX/countY/latched_count_component_id
 What:		/sys/bus/counter/devices/counterX/countY/prescaler_component_id
 What:		/sys/bus/counter/devices/counterX/countY/preset_component_id
 What:		/sys/bus/counter/devices/counterX/countY/preset_enable_component_id
@@ -218,6 +230,7 @@ What:		/sys/bus/counter/devices/counterX/signalY/cable_fault_enable_component_id
 What:		/sys/bus/counter/devices/counterX/signalY/filter_clock_prescaler_component_id
 What:		/sys/bus/counter/devices/counterX/signalY/index_polarity_component_id
 What:		/sys/bus/counter/devices/counterX/signalY/synchronous_mode_component_id
+What:		/sys/bus/counter/devices/latch_mode_component_id
 What:		/sys/bus/counter/devices/unit_timer_enable_component_id
 What:		/sys/bus/counter/devices/unit_timer_period_component_id
 What:		/sys/bus/counter/devices/unit_timer_time_component_id
@@ -244,6 +257,22 @@ Description:
 		counter_event data structures. The number of elements will be
 		rounded-up to a power of 2.
 
+What:		/sys/bus/counter/devices/counterX/latch_mode
+KernelVersion:	5.16
+Contact:	linux-iio@...r.kernel.org
+Description:
+		Read/write attribute that selects the trigger for latching
+		values. Valid values are device-specific (given by
+		latch_mode_available attribute) and may include:
+
+		"Read count":
+			Reading the countY/count attribute latches values.
+
+		"Unit timeout":
+			Unit timer timeout event latches values.
+
+		The latched values can be read from latched_* attributes.
+
 What:		/sys/bus/counter/devices/counterX/name
 KernelVersion:	5.2
 Contact:	linux-iio@...r.kernel.org
@@ -298,14 +327,6 @@ Description:
 		Active level of index input Signal Y; irrelevant in
 		non-synchronous load mode.
 
-What:		/sys/bus/counter/devices/counterX/signalY/index_polarity_available
-What:		/sys/bus/counter/devices/counterX/signalY/synchronous_mode_available
-KernelVersion:	5.2
-Contact:	linux-iio@...r.kernel.org
-Description:
-		Discrete set of available values for the respective Signal Y
-		configuration are listed in this file.
-
 What:		/sys/bus/counter/devices/counterX/signalY/name
 KernelVersion:	5.2
 Contact:	linux-iio@...r.kernel.org
-- 
2.25.1